If its like the audi/vw types then remove throttle body and spray carb cleaner on the butterfly to remove the carbon build up first as this sometimes clears the problem.

Sorry but cant help much more as currently have 1.9dci and not to hot on the 1.6 petrol model

 

Hey there,

please don't try to unscrew anything from the throttle body, you'll end up with a big bill from Renault to put it right.
The throttle on a Lag II is motorised and electronicly linked to the throttle pedal via the ECU, there is no throttle position sensor there as we know it just a motor plus some other gubbins which opperates the butterfly.

By all means remove the throttle body and give it a clean with carb cleaner, I used brake cleaner on mine. There are only 2 10mm bolts holding it on.

Don't try to move the butterfly either as you risk damaging the motor that operates it. However, (take this with a pinch of salt as I don't want to be held responsible for breakages!) I found with mine, if the ignition was off and the key card in your back pocket you can move the butterfly, carefuly do it by hand, and if you feel any resistance leave well alone.

Sounds like your car is going into limp mode though, have a look at the ECU which is under the battery tray, common problem on the Lag's is the connection on the ecu to the loom some times has water ingress and the contacts corrode. Give this a clean and see if it solves your problem before you fork out for a new throttle body.

all the best
Mike

 

Hey there,

please don't try to unscrew anything from the throttle body, you'll end up with a big bill from Renault to put it right.
The throttle on a Lag II is motorised and electronicly linked to the throttle pedal via the ECU, there is no throttle position sensor there as we know it just a motor plus some other gubbins which opperates the butterfly.

By all means remove the throttle body and give it a clean with carb cleaner, I used brake cleaner on mine. There are only 2 10mm bolts holding it on.

Don't try to move the butterfly either as you risk damaging the motor that operates it. However, (take this with a pinch of salt as I don't want to be held responsible for breakages!) I found with mine, if the ignition was off and the key card in your back pocket you can move the butterfly, carefuly do it by hand, and if you feel any resistance leave well alone.

Sounds like your car is going into limp mode though, have a look at the ECU which is under the battery tray, common problem on the Lag's is the connection on the ecu to the loom some times has water ingress and the contacts corrode. Give this a clean and see if it solves your problem before you fork out for a new throttle body.

all the best
Mike

Hey there,

please don't try to unscrew anything from the throttle body, you'll end up with a big bill from Renault to put it right.
The throttle on a Lag II is motorised and electronicly linked to the throttle pedal via the ECU, there is no throttle position sensor there as we know it just a motor plus some other gubbins which opperates the butterfly.

By all means remove the throttle body and give it a clean with carb cleaner, I used brake cleaner on mine. There are only 2 10mm bolts holding it on.

Don't try to move the butterfly either as you risk damaging the motor that operates it. However, (take this with a pinch of salt as I don't want to be held responsible for breakages!) I found with mine, if the ignition was off and the key card in your back pocket you can move the butterfly, carefuly do it by hand, and if you feel any resistance leave well alone.

Sounds like your car is going into limp mode though, have a look at the ECU which is under the battery tray, common problem on the Lag's is the connection on the ecu to the loom some times has water ingress and the contacts corrode. Give this a clean and see if it solves your problem before you fork out for a new throttle body.

all the best
Mike

Hello Mike, I've got an issue with my Laguna ii. It keeps showing an electric fault sign and i can't go pass 20 rpm and 50km/h. As long as that sign is there i can't go fast. Here's a picture of my dashboard lights.

Could you please help me with a fix for it?

 

hi mate cheers for that are the bolts holding the throttle body same on all engines myne is a 1.6,sorry for sounding thick but where are the bolts located do u have a pic or diagram,thanks

 

Sorry mate I don't have a pic, bit dark to take one now:rofl:

The bolts should be the same size on a 1.6 as a 1.8, same basic engine just a bigger bore size. The bolts are located behind the airfiler housing on the back of the engine. Attached to the throttle body is a black plastic box containing the air filter on the back of the engine, this is held on by 2 torx screws, one either side of the throttle body. You won't be able to remove the air filter housing as it'll catch on the bulk head but it should drop out of the way for you to get to the bolts on the throttle body. The bolts are located just underneath the inlet to the throtte body.

Hope this helps.

 

Just a little additional info to add to Mikeys reply, i had a problem freeing the air filter housing from the throttle body. In desperation i reached and tugged it from underneath and it came away quite easily. This allowed access to the 2 x 10 mm bolts.
Used brake cleaner to clear a fair bit of gunk from butterfly, laguna is idling perfectly now.

Hope its a help

 

Laguna II Throttle Control Body (Petrol)

Hi All
Just a note about my findings on my good old bus.
As my engine was getting to temp and as i was constantly stop starting at junctions and traffic the very second i depressed the clutch the revs would fall and the car would stall (dash would light up like a Christmas tree). There was never a problem restarting the car but it would constantly keep cutting out until up to temp. This is very dangerous and can be a bit of a white knuckle ride if your not on the ball.
This really got under my skin and i went about looking for a cure. I took out the TDC sensor (with was well sh*ted up) and cleaned it, but still no joy. After some searching i happen to come across threads regarding the throttle control body/housing so i decided to investigate.

Air filter off (2 torq screws) and dropped the black plastic air feed box, that joins the throttle body off to the back of the engine, you'll need an 8mm star socket (£3) for the two long bolts on top of the body.
Removing this gives you limited access to the back of the throttle body and the butterfly. I had a feel with my fingers and sure enough there was a shed load of gunk built up on the inside of the housing and on the butterfly itself. My guess is that because it has a texture a bit like prit-stick glue when it is cold and there is not much call for large amount of air the pressure is unable to hold the butterfly open. This changes when the gunk gets warmer and is more plyable.

I didn't take the throttle control body off as i was limited to time (it was about -4 outside and i had lost feeling in my fingers) but i managed to clear a decent amount of gunk off the butterfly and off the inside of the housing. I had no problem opening the butterfly (dont take my word for it, it's your call) and was able to use a feeler guage (thin and bendy) to do a little excavation of the gunk.

NB - Please note that the edges of the butterfly are very, very sharp (as i can testify).

I put it all back together and hay presto its been running like a dream ever since. I intend to take it fully off and give it a proper clean in due time but this was a very quick fix for a non car minded person. So for about 30mins its worth a look.

ADVICE NEEDED - How do i remove the throttle control body? Is it just the two 10mm bolts facing the bulkhead?

 

Laguna Stalling/Throttle Body

Hi everyone.
Just to let you know,i too had a problem with low revs and stalling when engaging the clutch and gearing down ready to stop.
After reading several threads i decided to clean the throttle body, with carbcleaner. Spray and wipe, be careful with the butterfly though.
Hey presto revs are ok and touch wood no more stalling.
Thanks to everyone.
PS Check the air filter as well!!!!!!!!

 

Hi Pepbri
How did you remove the throttle body?
Was it just a case of unscrewing the two 10mm bolts on the back of the body housing (facing the bulkhead?
Cheers, all help greatly apped

 

Hi Psychic Snowboarder.
Unfortunately i didn't take it off, removed the air filter and casing to get at it.
Sprayed, wiped as best i could, holding open the butterfly with the cable guide.
As i said i cleaned it the best i could but it made the difference.
No more stalling due to rev drop and alot better tickover.
Regards Pepbri.

 

Throttle Body on Scenic II

Seem to be loads of tips on cleaning Throttle Body on Lagunas. Would all the advice in these replies also apply to cleaning throttle body on a Scenic II 1.4 petrol. Looking for info on doing this and don't seem be able to find any. Are there any major differences between doing this job on a Laguna vs Scenic II????

Any help would be much appreciated.

:d

 

Hi guys.
I`ve had similar probs with my Laguna with stalling and eratic tick over.
When you remove the throttle body do you have to de-pressurise the fuel system or just take it off and clean ?

 

hi guys, i have just bought a laguna with the same problem, error codes being po120 for the throttle sensor and po500 for the speed sensor, did you have anyluck in fixing it, if so how did you do it, thanks
mac

 

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